package com.mall.ware.service.impl;

import com.alibaba.fastjson2.TypeReference;
import com.mall.common.exception.NoStockException;
import com.mall.common.to.mq.OrderTo;
import com.mall.common.to.mq.StockDetailTo;
import com.mall.common.to.mq.StockLockedTo;
import com.mall.common.utils.R;
import com.mall.ware.entity.WareOrderTaskDetailEntity;
import com.mall.ware.entity.WareOrderTaskEntity;
import com.mall.ware.feign.OrderFeignService;
import com.mall.ware.feign.ProductFeignService;
import com.mall.ware.service.WareOrderTaskDetailService;
import com.mall.ware.service.WareOrderTaskService;
import com.mall.ware.vo.*;
import com.rabbitmq.client.Channel;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.beans.BeanUtils;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.mall.common.utils.PageUtils;
import com.mall.common.utils.Query;

import com.mall.ware.dao.WareSkuDao;
import com.mall.ware.entity.WareSkuEntity;
import com.mall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {
    @Autowired
    private WareSkuDao wareSkuDao;

    @Autowired
    private ProductFeignService productFeignService;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    @Autowired
    private WareOrderTaskService wareOrderTaskService;

    @Autowired
    private WareOrderTaskDetailService wareOrderTaskDetailService;

    @Autowired
    private OrderFeignService orderFeignService;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)) {
            queryWrapper.eq("sku_id", skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)) {
            queryWrapper.eq("ware_id", wareId);
        }
        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params), queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        // 1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.isEmpty()) {
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            // 远程查询sku的名字，如果失败，整个事务无需回滚
            // 1、自己catch异常
            // 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);

                //  Map<String, Object> data = (Map<String, Object>) info.get("skuInfo");
                //  if (info.getCode() == 0) {
                //      skuEntity.setSkuName((String) data.get("skuName"));
                //  }
                /**
                 * 通过这种方式，消除未检查的类型转换警告
                 * Optional.ofNullable(info.get("skuInfo")): 如果skuInfo不为空，则创建一个Optional对象，否则返回一个空的Optional
                 * filter(Map.class::isInstance): 过滤掉不是Map类型的对象。
                 * map(Map.class::cast): 将对象转换为 Map<String,Object>类型。
                 * ifPresent(data -> ...): 如果Optional中有值，则执行设置skuName的操作。
                 */
                Optional.ofNullable(info.get("skuInfo"))
                        .filter(Map.class::isInstance)
                        .map(Map.class::cast)
                        .ifPresent(data -> skuEntity.setSkuName((String) data.get("skuName")));
            } catch (Exception ignored) {
            }
            wareSkuDao.insert(skuEntity);
        } else {
            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        return skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            // 查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count != null && count > 0);
            return vo;
        }).collect(Collectors.toList());
    }

    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单详情信息
         * 追溯
         */
        WareOrderTaskEntity wareOrderTaskEntity = new WareOrderTaskEntity();
        wareOrderTaskEntity.setOrderSn(vo.getOrderSn());
        wareOrderTaskEntity.setCreateTime(new Date());
        wareOrderTaskService.save(wareOrderTaskEntity);

        // 1、按照下单收货地址，找到一个就近仓库，锁定库存
        // 2、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map((item) -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            // 查询这个商品在哪个仓库有库存
            List<Long> wareIdList = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIdList);
            return stock;
        }).collect(Collectors.toList());
        // 3、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();

            if (org.springframework.util.StringUtils.isEmpty(wareIds)) {
                //没有任何仓库有这个商品的库存
                throw new NoStockException(skuId);
            }
            // 3.1、如果每一个商品都锁定成功,将当前商品锁定了几件的工作单记录发给MQ
            // 3.2、锁定失败,前面保存的工作单信息都回滚了。发送出去的消息，即使要解锁库存，由于在数据库查不到指定的id，所有就不用解锁
            for (Long wareId : wareIds) {
                // 锁定成功就返回1，失败就返回0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if (count == 1) {
                    skuStocked = true;

                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "",
                            hasStock.getNum(), wareOrderTaskEntity.getId(), wareId, 1);
                    wareOrderTaskDetailService.save(entity);

                    // 告诉MQ库存锁定成功
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(wareOrderTaskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(entity, detailTo);
                    lockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange", "stock.locked", lockedTo);
                    break;
                } else {
                    // 当前仓库锁失败，重试下一个仓库
                }
            }
            if (!skuStocked) {
                // 当前商品所有仓库都没有锁住
                throw new NoStockException(skuId);
            }
        }
        // 4、肯定全部都是锁定成功的
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {
        System.out.println("收到解锁库存的消息");
        StockDetailTo detail = to.getDetailTo();
        Long detailId = detail.getId();
        // 解锁
        // 1、查询数据库关于这个订单的锁定库存信息
        // 有库存：库存锁定成功，需要解锁
        // 1.1、解锁：订单情况
        // 没有这个订单，必须解锁
        // 有这个订单，不是解锁库存
        //     订单状态：已取消，解锁库存
        //             没取消，不能解锁
        // 没有库存：库存锁定失败，库存回滚了，无需解锁
        WareOrderTaskDetailEntity byId = wareOrderTaskDetailService.getById(detailId);
        if (byId != null) {
            // 解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = wareOrderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            // 远程查询订单信息
            R orderData = orderFeignService.getOrderStatus(orderSn);
            if (orderData.getCode() == 0) {
                // 订单数据返回成功
                OrderVo orderInfo = orderData.getData("data", new TypeReference<OrderVo>() {
                });

                // 判断订单状态是否已取消或者支付或者订单不存在
                if (orderInfo == null || orderInfo.getStatus() == 4) {
                    // 订单已被取消，才能解锁库存
                    if (byId.getLockStatus() == 1) {
                        // 当前库存工作单详情状态1，已锁定，但是未解锁才可以解锁
                        unLockStock(detail.getSkuId(), detail.getWareId(), detail.getSkuNum(), detailId);
                    }
                }
            } else {
                // 消息拒绝以后重新放在队列里面，让别人继续消费解锁
                // 远程调用服务失败
                throw new RuntimeException("远程调用服务失败");
            }
        } else {
            // 无需解锁
        }
    }

    /**
     * 防止订单服务卡顿，导致订单状态消息一直改不了，库存优先到期，查订单状态新建，什么都不处理
     * 导致卡顿的订单，永远都不能解锁库存
     */
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        // 查一下最新的库存解锁状态，防止重复解锁库存
        WareOrderTaskEntity orderTaskEntity = wareOrderTaskService.getOrderTaskByOrderSn(orderSn);

        // 按照工作单的id找到所有 没有解锁的库存，进行解锁
        Long id = orderTaskEntity.getId();
        List<WareOrderTaskDetailEntity> list = wareOrderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id).eq("lock_status", 1));
        for (WareOrderTaskDetailEntity taskDetailEntity : list) {
            unLockStock(taskDetailEntity.getSkuId(),
                    taskDetailEntity.getWareId(),
                    taskDetailEntity.getSkuNum(),
                    taskDetailEntity.getId());
        }
    }

    private void unLockStock(Long skuId, Long wareId, Integer skuNum, Long taskDetailId) {
        // 库存解锁
        wareSkuDao.unLockStock(skuId, wareId, skuNum);
        // 更新工作单的状态
        WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity();
        taskDetailEntity.setId(taskDetailId);
        // 变为已解锁
        taskDetailEntity.setLockStatus(2);
        wareOrderTaskDetailService.updateById(taskDetailEntity);
    }
}